The Encrypting File System (EFS) in Windows XP lets you encrypt files in an NTFS volume. If you add the option to encrypt or decrypt file to this menu, when a user right-clicks a file or folder on an NTFS volume, the option to Encrypt or Decrypt appears in the list of options. Note that the EFS feature isn't included in Windows XP Home Edition.
To add EFS options to the shortcut menu
1. In the Run dialog box, type regedit.
2. Navigate to the subkey
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\Explorer\Advanced
3. On the Edit menu, point to New, and then click DWORD Value.
4. Enter EncryptionContextMenu for the value name, and 1 for the Value Data.
You may need to have Administrative Rights to edit the Registry.
To add EFS options to the shortcut menu
1. In the Run dialog box, type regedit.
2. Navigate to the subkey
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\Explorer\Advanced
3. On the Edit menu, point to New, and then click DWORD Value.
4. Enter EncryptionContextMenu for the value name, and 1 for the Value Data.
You may need to have Administrative Rights to edit the Registry.
